album-tools v0.1.17

Album directory name defaults to album name

Less memory used: Download dict no longer returned or held in `main()`.

Improved UX: Album name flows automatically as directory name suggestion.

Robust fallback if album name is missing* `do_yt_dlp()` now returns
  the album name as a string, or an empty string if not available.

In `main()`, after download, the user is prompted for a directory to move the files into:
 - If an album name was found, it is shown as the default in brackets, which is used if the user presses
enter.
 - If no album name is available, input is required and repeatedly prompted until a non-empty string is
provided.